Expression help needed

[Dan Ebberts]

Try this:

A = thisComp.layer(“a”);
B = thisComp.layer(“b”);

a = A.toWorld(A.anchorPoint);
b = B.toWorld(B.anchorPoint);
2*b – a

Dan

[Jon Smith]

Worked liked a charm. Makes complete sense once you write it out. Thank you so much.

[Jon Smith]

I now have a new problem. What If I don’t want C to equal the distance betweem A and B. I want to be able to move C around but keep it at the correct angle?

[Dan Ebberts]

One way would be to add a slider to c and change the expression to this:

slider = effect(“Slider Control”)(“Slider”);

A = thisComp.layer(“a”);
B = thisComp.layer(“b”);

a = A.toWorld(A.anchorPoint);
b = B.toWorld(B.anchorPoint);
b + (b-a)*slider

You might want to adjust the slider range so that it only goes from 0 to 5 instead of 0 to 100.

Dan

[Jon Smith]

Thanks once again Dan Ebberts!